Susanne Paulus, Assistant Professor of Assyriology at the University of Chicago, answers the question “…the cuneiform scripts used in Assyria and Babylonia in the 1st millennium BC (Neo-Assyrian and Neo-Babylonian periods) were different. How different were these signs? Approximately what percentage of the signs were identical?” Just the sight of the images in the post brought back my (difficult but rewarding) study of Hittite several decades ago; I think I could write my name in cuneiform at one point, but I have no idea which script I chose (or whether I knew about these differences back then). I like the conclusion:
In the library of the famous Assyrian king Assurbanipal (7th century BC), tablets in Neo-Assyrian and Neo-Babylonian scripts were found together. Jeannette Fincke, who studied the paleography of these scribes, discovered that the famous scholars who wrote the tablets had mastered both scripts. But their knowledge was not limited to the first millennium sign forms; sign lists (figure 4) prove that they also studied the earliest sign forms written more than 2,500 years ago. This shows the impressive continuity of Mesopotamian culture!